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Investments, Investment Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Investment Gains (Losses) [Abstract]        
Investment gains (losses) [1] $ 22 $ 46 $ 657 $ (1,312)
Fixed Maturity Securities [Member]        
Investment Gains (Losses) [Abstract]        
Gross gains 50 44 159 175
Gross losses (28) (18) (68) (207)
Investment gains (losses) 22 26 91 (32)
Equity Securities [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses) (2) 25 17 (45)
Derivative Instruments [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses) 2 (2) 7 (7)
Short Term Investments and Other [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses)   (3) 2 (17)
Altium Packaging [Member] | Sale of Interest [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses)     555  
Diamond Offshore [Member]        
Investment Gains (Losses) [Abstract]        
Investment gains (losses)     (15) (1,211)
Nonredeemable Preferred Stock [Member]        
Investment Gains (Losses) [Abstract]        
Recognized gains (losses) on securities $ (2) $ 25 $ 15 $ (44)
[1] During the three and nine months ended September 30, 2021, $2 of investment losses and $15 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of September 30, 2021. During the three and nine months ended September 30, 2020, $25 of investment gains and $44 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of September 30, 2020.